问一个关于游标的问题

游标是这样写的：
begin
     declare
            v_ProUser varchar2(30000);
            v_Count   varchar2(30000); 
            v_bianhao varchar2(20);
            v_summary varchar2(2000);
            v_unit    varchar2(20000);
            v_pkid    varchar2(100);
                    
     Cursor ProUserCursor is
            select 
                   a.f_propose_man,
                   count(*) as vcount
            from
                t_duban_zhengxie_propose a
            group by 
                  a.f_propose_man;
     Cursor ProUserPkId is
                 select c.pk_id 
                 from 
                      t_duban_zhengxie_propose c
                 where 
                      c.f_propose_man = v_ProUser;             
     begin
          open ProUserCursor;
          Loop
          Fetch ProUserCursor into v_ProUser,v_Count;
          Exit when ProUserCursor%Notfound;
          
          dbms_output.put_line('提案人：'||v_ProUser||' '||v_Count||'件');
          dbms_output.put_line('============================================');
          dbms_output.put_line('提案号'||' 案 由 '||' '||'单位名称');          
          dbms_output.put_line('============================================');
            begin
                 open ProUserPkId;
                 Loop
                 Fetch ProUserPkId into v_pkid;
                 Exit When ProUserPkId%Notfound;
                 
                 select 
                       b.f_bianhao,
                       b.f_summary,
                       b.f_undertake_unit              
                       into
                       v_bianhao,
                       v_summary,
                       v_unit
                from
                       t_duban_zhengxie_propose b
                where 
                       b.pk_id= v_pkid;                 
                dbms_output.put_line(v_bianhao||'   '||v_summary||'   '||v_unit);
                
                Fetch ProUserPkId into v_pkid;
                end loop;
                Close ProUserPkId;
            end;
            dbms_output.put_line('============================================');
          Fetch ProUserCursor into v_ProUser,v_Count;
          end loop;
          Close ProUserCursor;
     end;
end;          这是什么问题？急